Entry 1 sense Webster, 1913 Photometric /fō'tə-mĕt'rĭk/ · Pho·to·met·ric · IPA /ˌfoʊ.təˈmɛt.ɹɪk/ 01 a. Of or pertaining to photometry, or to a photometer. 1. Of or pertaining to photometry, or to a photometer.